Phys. Rev. Lett. 91, 027401 (2003) [4 pages]Quasiparticle Relaxation Dynamics in Heavy Fermion CompoundsReceived 11 February 2003; published 8 July 2003 We present the first femtosecond studies of electron-phonon (e-ph) thermalization in heavy-fermion compounds. The e-ph thermalization time τep increases below the Kondo temperature by more than 2 orders of magnitude as T=0 K is approached. Analysis using the two-temperature model and numerical simulations based on Boltzmann’s equations suggest that this anomalous slowing down of the e-ph thermalization derives from the large electronic specific heat and the suppression of scattering between heavy electrons and phonons. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.91.027401
DOI:
10.1103/PhysRevLett.91.027401
PACS:
78.47.+p, 71.27.+a
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